Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a336da20f8796ed5e065eff7d2a646a25c2661dd895d43d1b4a0b906667dfae' 
  AND token = 'Hz8ierMKUmpwmtWqGy2qELP8iHgLmMQvV8qHJdtooP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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