Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85c7e4dc122db47a2ec396870225090a5812a67802379ae7195db24d859cdfc' 
  AND token = '27qHvIKCY1TGGY8dvzPUGri5fCbG8PXaZdeZuXTwhPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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