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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fef19982a3fdf44bf811c71e30c0d150b0d69531920eb2e3a857ce7af56bd5af' 
  AND token = 'W68bP7sTgSj93NweAD5b829mavg/3KBkDhaveOj2TaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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