Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e06b2fb86622c28b7fa8f51f761432c4db04c5b2e6ea49e4644bb1da6836b47' 
  AND token = 'MlMSA4qaTQOiOODCBfNaz8dLe5eOiWJ7FJ+N5tKISms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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