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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c7827d9fecfbc7ede51e675e48dea59b788c2539cd430ac001abdc1ebacc264' 
  AND token = 'lBZh3AOxs9oZpcq96KKQMmSgoGf8Ez4Z1Yh7DUNi5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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