SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4af40a4b077de916a3e6a98a8e8562327885cee132ff40ee5ad97f36339b484d' 
  AND token = 'K2xRgVFxpaR8LjZT/xWcQ5V2qXUkb1WmWh4T9figyXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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