Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3968d2ae05e33fead20ceb66f46441c9f4b8d33114399bf36d7262c98592a3d8' 
  AND token = 'Zu32yZZ/L+boYYfrvmtEnxg+nK+Zf/2xMm1EQw3z5rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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