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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03f19848866bf7d067ceae752420a91a232325882e47f5ae11e11970a67b0a75' 
  AND token = '6YUge6dShi9NbJgrAqkVJmiGRl4ei8Sn6zttBuFwarM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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