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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd27e8fc5d6a0d86acf3d2c21b85555b010698e492d3b7f96b5af326c88b02828' 
  AND token = 'ryB0YgqWZqCs76f1f0OrlTr7Lq+7BQSvTuGA04FgkXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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