Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ada2ff53f317cc381e6b79758110be8823864d5521b9976663b22233b9470166' 
  AND token = '+S1WmhPp11LyfSRZKAtaEpWjhH0TLUE6LI0GdMPAgug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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