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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f1679c8fc3ff041ea6a24b25b139113bf23937eed68b01adb01fd7b7a4436abb' 
  AND token = 'o2T1d7T+KxXRNwf20VVssDw7CCgpqcOMi/3Hbj5yVU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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