Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd221964357848feed4608ea2b786213916d55f7280ed59cee6b7952a1c22bc23' 
  AND token = '8JLqXVqMsN5I5oFEAx491aXjLfYoV8mGosSfAuzKdug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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