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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c45e1b8ef320c82e7fa166a191fd4809cdd9c675d4a6766c22fd22a9a982d311' 
  AND token = 'OynRlN5DAycv3SJrCVKfDabuqHh+zstVLkyluhZAVp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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