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Replace the air in the balloon with, for example, hydrogen. Then you have your explosion.
Since air in the balloon is not combustible, at most the candle is blown out. That’s all. The air in the balloon is under low pressure. When the balloon tears, the air expands abruptly. Therefore, the bang, because the expanding air generates a pressure wave that perceives our eardrum as a bang.
So Knall, explosion no.
Unfortunately, I forgot to mention that the balloon was inflated and then was placed under the candle. Does that make any difference?
I was thinking