Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5ed6710eb897443c330c69d32a388bb2518eed42da8e78fd314b0481e28773' 
  AND token = 'W4y3foQlEJFYZ6NyegZs22oboClgZk1Qq462vWlzkcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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