Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e0f275dc68c7568a040c9540237e68b8b9b9b28e7e005cacb0e27cbe49a9cd' 
  AND token = 'LLjRE1fAgo4SDHuaprwFevLzi9G2zS40JgMBLLEb8hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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