Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8633721edbc572050727bd17ede94be9aff990ff4cdd4908d901044e31d5a43' 
  AND token = '3f/VoL3YQE8afL/3++WeU8miAArhR7EUcYD6cSHD6SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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