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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '896983999637a8f3cbbc639ada1fd361340c6b85e5a1eed7a8f2a29c6f1f8ede' 
  AND token = 'jEiwCoM/jY981u9+XnXu255Evb/xemdUxmsvW/EZVh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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