Memnoch is right, there are actually 2 keys you use in the sewers, the first is the one you are asking about, the sewer key. You use that at the adventuring party area.
The 2nd key, the one you get for accepting the Unseeing Eye quest from the followers, opens the door to the lower levels, where the beholders and undead and the 2 part rod are. You need to do this quest in order to get the remaining golden lich pieces for the demi-lich.
So really, you REALLY want to do this quest.
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