Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d82f6638286d460313557cf20dd4e4f9c7a0966ec0dbf69850826e5e31ac31' 
  AND token = '3Tub3aPau18Xqg3f569+gzKXO7qSGS1n5EEbmJF+uaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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