Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd491044be6f9dc546a6837cc76fdf1b7c58ed4dacb9c174270c120d1249d2ee' 
  AND token = 'x6KtAtnkwy3wi3YKYF3i9hDjF0TbGV4VV6+I1/kWRP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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