Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78fd88d534594d27751a73dcf2f61ed539e11684eda39a44f88cf4e562e3af6' 
  AND token = 'MZtKsAjP7fCsHjeP8U0T07zHO6VkmR/xHUCIvRzZLYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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