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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9a9a537e04cbed9a821bfff91f45871350325eb9e1057390ed53f529a5ff3e3' 
  AND token = 'Ma7AkzEX45r3z+xgng9XIpUM8iR7UTTRA3AMECqdoMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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