Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c70f9c9a21c1eac9cf90056868a68ddbb383574de4e98916b01c71deb9d7785' 
  AND token = '7Hahkwmf3X3ioX4k4la3I/S7Bfg+146bD/otMTVXxwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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