Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f9956a8ea338ce145b22effc802bbc960fb339f679d696bdf32bed9c50475c' 
  AND token = 'n5BvgyEIQLgPEC1ZW0v7L8Kf2VAl8mf3e6fIdKMHDlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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