Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853471847f05b6440741212956737f10c5cc5b074edd08ba0c5e85ea72edbf05' 
  AND token = 'FoXh53khgVXc9DMgstf64wQAUxta4ZZG2MTAYvnrPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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