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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9360ed760858d9ee34562f0950d06bcccf382bdf4801c0f673f4d19df54beb8a' 
  AND token = 'dfdcfWivZmknTpAWHtBBY7TpZkqmkvUPkT5ql8E4W3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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