% ./tst.pl 
$VAR1 = [
          {
            'RSSI' => '12',
            'SNR' => '18',
            'MAC' => '01:23:45:67:89:ab'
          },
          {
            'SNR' => '3',
            'RSSI' => '7',
            'MAC' => 'ba:98:76:54:32:10'
          }
        ];
MAC ba:98:76:54:32:10 has SNR 3
Can't find MAC thi:is:is:nt:re:al