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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f35f8aa8466c2fad9e3b6968d957b65e3a9a19de9225013e384912a43993e41' 
  AND token = 'QATWVnx9EicvkMZ862YVIQhuGSJLyL6QO5uvknMrVhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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