Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41966111af9008b442720f986f6011f28e85734e433681fd29ad602eb948ba94' 
  AND token = '2wXae08Xt4lYu2xRbS9KgMk3GUCK0LBWxekfWz35NEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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