SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a6c0a65a8e135d62a65b6303c79c5564dbaa1482a467e71b5e05d4b36ff4b5b8' 
  AND token = '0GgjtHM8BWXzmAv9D9qSlJ/g4Xr6QHR/10H19gXeMFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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