The ornamental design for a key chainlight, as shown and described.
FIG. 1 is a front elevational view of the key chain light showing my new
design;
FIG. 2 is a side elevational view;
FIG. 3 is a top plan view; and,
FIG. 4 is a bottom plan view.
The broken line showing of indicia in FIG. 1 and of a connecting chain with
clip in FIGS. 1 and 3 is for illustrative purposes only and forms no part
of the claimed design.