Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09e6a9a36d14ce5600f18339477391ba06eafc14dae102909e3b8b77fdde78c' 
  AND token = 'PnWAgWlwjvKwKxuGyst2UpafHbLts5PlLiWioG9JSH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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