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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93c502a5236180659c7e7a02154a1e5bb4f1d6df914f7b7871365c44b97a20a1' 
  AND token = 'nLWWWRJ3BoRWtqy/XEmOIzJ7l6xYmjVM4SR8yLSABtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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