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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5469db70acc6bbbd7a670ee07074a1417c4da474f840a43dcd9c10dfe2db3e32' 
  AND token = 'Xu+1OTyyygStzlXliJWbHV6p4gk1pJOSBKwXySuwN9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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