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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a26a30e197bb4e3016b6a602c93a4b1f23b689781ac4b823eca322c61aa92afd' 
  AND token = 'YMioGISuxmGkm5r/XQt4KZhyMACMl4Fiigg2vxEBgfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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