Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa1ffe420c01e3c597e9686d14d23f5a098e34753a3881a553c566621e1c3f1' 
  AND token = 'aXnMCmPVTIKJ2cvZGzqxe1bl9+cJ0cY5EvwKXtTxHHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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