Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc265af581175e295c5670fb8a321a259d1267fcee03b0e11357a2ebe0f426e6' 
  AND token = '+kP6SN2Asfpq6ZQQdzYNhu5eLpDHlvpLEG0ofkQ9C/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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