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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '831c8a1fb49a96d06306f3d4ca9cb6678e13295ac92f5dc29fd3e406cbd0fadc' 
  AND token = 'Ury9NoC19moWuChsfGIxyxTP512ewk4QQZrTQdrIdBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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