Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71658d8e5c3de83697963d453b13f6fe9bc7c6e81874040db23301d838a3bb52' 
  AND token = 'CKPSBaQFgMSnCiH223SqRFB/b35Lelq1BwTU469/kM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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