Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fc9732d9946f8def4b9584a57a30168b8b4319f0904ac4c9f4c77caee6ad82' 
  AND token = 'd5dXkZVuusB0TSoh3VuENH7acqP7MuAQPrKOcQ8Pr2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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