Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b5b656986be4181103484c90d9779eceedbeca4e812df159134422696df730' 
  AND token = 's02yiQuE/KlN6BqHpySPudzkna2fQ9pfgGPUiNzjFgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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