Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e708732cc474e8f74fc882324685bb37ee84f7e43e0cb9c1645b2bdccb7ab8b' 
  AND token = 'vrLBJKEB3pDD+LumcyS3RUDIvFd3T5Dr5kzTnU9HIzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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