Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a690f58d76540a52a61aa896cc48799f9caa5e6268bd9b09e16075e398b7568a' 
  AND token = 'oSWCDHBPsUjpoTmEessLTd8OuAUGkyoMgE//dmOJ3vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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