Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3719e8e4d78e9089eccabac5d5dd75698ed643a4aa8f2b777c263a970bb956' 
  AND token = '6W8XXGYMG+WO78GHbAzMaMejiodszg4rcSnYPzTQsjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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