Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16389cd4ca14532290b806fd0c8d7ff4e86b183ba328d3a9dbbe7c9da6f5a40c' 
  AND token = 'UAvNOHuKBSabbHOr3qrlniO7AaAaII4P/MiRVuFkP+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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