Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404e3d8e0c33e5f4d3ed8e38968274367814a2a8095baf966cde8ba135b6f45a' 
  AND token = 'lkkR5RkesUIfnMqA3MQKgVfQ6nGSXdo8+AvhWQsoUP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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