Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc26cb1971783ca003b9d23a8f98ea41f4843432381b5b117490a85dba51363' 
  AND token = '4h2ZeLum0ruUVAdNQnVeYndj3wpI6GWCtUX1zApY2I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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