Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5289d2d6d458344c291d2e6f88787f70ddbc4da7bfc29b1c5b17522b2b127ba' 
  AND token = '02mlQ9BVCJ8K48BIw8u0iHQ5MfgDEbO1B2MRkXTOvMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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