Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb79761508d849595e80fe904bdff08aa8ea5c5dacc8ab3069f26c23a43e614' 
  AND token = '3Y8Yz7p+SQ4fLsNvXc1oTLb/qtDB+zf0KQdbDeZnsG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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