If the key is composed of a metalic compound then it will conduct electricity. To answer your question , it depends on what material the key is made from.
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A candle in not in the electrical classification category as being used for an insulator.
Very low. It's used as an insulator.
The poorest insulator would be the best conductor, which is one of the noble metals. Bakelite is a fairly good insulator, not too long ago electrical fittings were made from it.
Any reference to isolating electrical components, an insulator is the first choice.
First AnswerYes it is and it can also withstand heat. For many years mica was used in toasters to make a framework to hold the heating elements.Next AnswerActually mica is a very good electrical INSULATOR, but is a good THERMAL conductor, which is why it was used for holding heating elements.