Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1748c1b8bd52751112494f6eff6d39b07541d1ba0556de790f8293a4985326' 
  AND token = 'MiGzSAHJatFMgUaN84z1J597Z0btgEnS0HcI/eUv/LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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