Candela literally means "candle" or "fire". However, in many Latin American contexts, especially in Colombia where Carlos Vives is from, it's often used colloquially to mean "trouble," "excitement," or a "difficult situation."
In this song, when Vives sings "Sube el oro, y la candela no para," he's playing on this double meaning. While it could literally refer to the heat or passion, it more likely implies that the "trouble" or intense energy of life keeps rising and doesn't stop, adding a vibrant, colloquial flavor to the lyrics.
Carlos Vives is here to tell you, "La vida es buena" [Life is good], and it's all up to you! This song is a fun, romantic declaration from someone who has cleared his schedule for love. He's got "tiempo" [time] for everything: "Hoy tengo tiempo de volver a enamorarte" [Today I have time to make you fall in love again], "Hoy tengo tiempo de llevarte a alguna parte" [Today I have time to take you somewhere], even "para llegar hasta Marte" [to get to Mars]!
He's completely smitten, saying, "Tú me tienes volando, tú me tienes soñando" [You have me flying, you have me dreaming]. Even with life's stresses like "Sube la hipoteca, sube la inflación" [The mortgage goes up, inflation goes up], his love for this person keeps him grounded and happy. He's a simple man, not swayed by fame, just happy to be with the one who gives him "Pinta sensual" [sensual vibes]. It's a joyful, energetic song about making time for what truly matters: love.