Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b89b337d8076558a62755591080387e696c15acd69669bb24a0ca177b5255d' 
  AND token = '4zxyiqOo+RA4btFHs5ZVHknXUY6Ig5foF3xTKcMnOW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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