Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f958b5cf557b88a134b23fd6f270de10632c0a5593b542f1d51ef3c3b3d1147d' 
  AND token = 'x9QSn2vtk7wHqKjFA/ffWzt1cFuZN3lhiJ8Qf1qaEB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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