  A precise determination of the effective $B_s^0 \rightarrow K^+ K^-$ lifetime
can be used to constrain contributions from physics beyond the Standard Model
in the $B_s^0$ meson system. Conventional approaches select $B$ meson decay
products that are significantly displaced from the $B$ meson production vertex.
As a consequence, $B$ mesons with low decay times are suppressed, introducing a
bias to the decay time spectrum which must be corrected. This analysis uses a
technique that explicitly avoids a lifetime bias by using a neural network
based trigger and event selection. Using 1.0 fb$^{-1}$ of data recorded by the
LHCb experiment, the effective $B_s^0 \rightarrow K^+ K^-$ lifetime is measured
as $1.455 \pm 0.046 \; \mathrm{(stat.)} \pm 0.006 \; \mathrm{(syst.)} \,
\mathrm{ps}.$
