Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19986a79e73e5e8a546b7d9ba85889fd0cfca5deb7f92a82fdbf4ee06e3f89da' 
  AND token = 'WVJ95SCPM2pzFu5McDE6XQIr1SuB97jFWdCdGKFkk9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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