Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f135f10d9cabfc0c50738a5cd7477335d91b8cdebd04c1c99156063c990a87' 
  AND token = 'YyCuYxo8yAPjHl1pJtpQmyjH4a8fEBnhMkgjvnh9vqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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