Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec2d7b83ff81784065098d6c3a6ed56c0f72c4e016fc5e6c7a3d1b467e18e9c' 
  AND token = '7rwqIejqT7F/S8zDPLcEIZil8c9NUnpUud3qjmZbpkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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