SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '40a24209878c61af8e308c1dc62a60d2c63e63f7e532b33d7c241ee69b72641c' 
  AND token = 'F1nyLxJ0k5shZ2dXbwMIuM7/Ajxv3BVlXz+YrakMeIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01582

JSON explain

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