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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c684c1b21d18f7ad80551084d3efca120155d9d2384b2187a820cfbfd7ea14f' 
  AND token = 'qXgLf3BAByfVpW7c9hjO0FCWyoJigiBBAJVfMoM4hL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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