Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3c725c3cffc5600ee5ec1acb08dda466c3e429d9eeec50f1e90aea2c99bad7' 
  AND token = 'AeWyWiRo3E3UKOKNmPeDRE6PRfpY86p/+mKgIxwZeUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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