Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8a5d4ca3ac4300ea256ed20a156090c0c7cad05ca4d71901fdb0b6a39f6678' 
  AND token = 'BnDEZS3WlRSOZoQUWWwXdxWTTof967aHYwj8JDEUPuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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