Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8599cc72d7fcfb0d934719ed7e38cf5ca97c958416a8edad18b94ac0aa33ae4' 
  AND token = 'GHaKUFJpRahPF9X308NFrKCzQVn7Bn5b7ewhRY1kDKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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