Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f22298a07bb0fe1b98d25ff8dc7d70b2f2fcedc7d4e6b5864eb271eccaded9' 
  AND token = 'x3MkZdzJLy2rdCK6VHgkHfvsgX5AtLRj6VWl9GdQS8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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