Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6551b43cd32951a195ce99a59d07d99bb1cf526413fb0d4c4ae6e0beb1ec21d' 
  AND token = '3zkrOrtKYE4q+BBD12VnZbYVUKXlKs5qjLD5aLqyqNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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