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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '565884cf7a732b7aaa1220003d104f152a45566bc9f7cc957316e78b470049bc' 
  AND token = 'C5DaTFlNxc1YxI4axj6Mu733IPpd2YIzBidgwxrFVks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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