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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '906d8828b4e27f80986dbd1debe6fc7fd6e53f8a67ad414bdba5202721eee41c' 
  AND token = 'GkK0qlChqBWvC1AAXFSCY+AZ/QtAead1UmM6ydfI7xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00789

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}