SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'de88ce48bf8eadb5bcd41c5f6ac27c87438d7af59874b2ac18597194f17b9dcd' 
  AND token = 'CIDDjIxYquKOQe8YSCtIs7/i+lzBow3gMUmI8wNHVaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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