The key that opens the serpent holds is the Serpent Key that Kreug gives you. If that was the one you used and it disappeared, your only two solutions are:
1...reload a game prior to using the key or
2...search through some recent threads for the answers you get from using the serpent idol in the library and reading the book. It is possible to get through the whole temple without having to see it and read it if you find the answers here.
I have never known a key to work where it is not supposed to though.
: )
Moni
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