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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3ac3be8bf91a59df15446c1d26d7d0b07ee1c0ee0fd13aadc6cef7ed88776879' 
  AND token = 'cUeloLn4NN2L8AxsUi4zC/n0M8ONsfpo/RIVles3tpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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