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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f1d8550dec9aad919fe407e749a4fba18153e382ba3ad70e4114ddf8870ff40' 
  AND token = 'Kmlo99SAs8x/wvRjRzqlchivEsNV8d5j7LVZS0G7ro8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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