Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccd65553c97621d5fe4f13c1619c90fcbebd0c7a28f96dddd9915865583ea42' 
  AND token = 'uwJtOz7drwnt+LUSaBdPMUmMwuE787u6O3ZnNDL3gWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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