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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1742f4d5ed2f1ec36cfec1eddb8a71c5fa7b8d42cb254fc9e5da2aa76375b876' 
  AND token = 'GHav4TBRCD8BiHDKiQ3+FbF0eqv6qExALsatpAXYppg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}