Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af5e5324906249dffd661092735226f1a80cfe9379eee3b91eb0ebdc5ceba00' 
  AND token = 'oHTsnQ1cVWz4842k9fNJ9Tj2CmP7hsHKWaQiVJuhyDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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