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From the current data on ${\\cal B}(B_s\\to \\mu\\mu)$ and ${\\cal B}(B\\to K \\mu\\mu)_{[15,22] \\,\\mathrm{GeV}^2}$, we obtain constraints on $\\mathrm{Re} C_{10}^\\prime$ and $\\mathrm{Im} C_{10}^\\prime$ which we then assume to be lepton specific, and find $R_K= {\\cal B}(B\\to K \\mu\\mu)/ {\\cal B}(B\\to K ee)_{[1,6]\\,\\mathrm{GeV}^2}=0.88(8)$, consistent with recent value measured at LHCb. 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From the current data on ${\\cal B}(B_s\\to \\mu\\mu)$ and ${\\cal B}(B\\to K \\mu\\mu)_{[15,22] \\,\\mathrm{GeV}^2}$, we obtain constraints on $\\mathrm{Re} C_{10}^\\prime$ and $\\mathrm{Im} C_{10}^\\prime$ which we then assume to be lepton specific, and find $R_K= {\\cal B}(B\\to K \\mu\\mu)/ {\\cal B}(B\\to K ee)_{[1,6]\\,\\mathrm{GeV}^2}=0.88(8)$, consistent with recent value measured at LHCb. 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