Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae61dec73d4406d59c0edf92f13a7b7019bf731bebd6013a0d7e18f9e3ce5056' 
  AND token = 'LOx3m6FkGpsK4m7eY1UHHeI+sCvEkUTMLFbVPdB7IE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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