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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'adfaad120246ba27724923888eddec01665684c42f24be76c13098567334bc3b' 
  AND token = '4pj6Ll24Bm8QXKJMii2QvBjMwdtBfzHgjCjdNLrQGN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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