Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81f8301c066d7cf03aa14e3256c2ea27f5a76f1a3eb61c2218655426d2554d7' 
  AND token = 'tIszHJkiueDsPek+9AdXHkTpr0K05JhWr/1tDK3lPlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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