Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b47b36b5564c1ac4fe3ef2f1e80ff914ea2a2b887d433fa6c8c00a54aadfaa' 
  AND token = 'VJBrCcJ0+Au/DlcGkcfyIEjVEQ5MpAJDm8VKnwNUySw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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