SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e0db8ca5de41499927c482c89dab3b50a43082ff1bf88daa70e043886f18289' 
  AND token = 'qhFOX9gL5olHUa5T/Elz2KYUKFRSNDmQ1kDUaqvDZYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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