SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f29ffec4fd7f64e03600de6a685457d871ba9abf35bace76c371aa4d1d476fca' 
  AND token = '0IqhwUTcW2siHgkNnqgvyGLZw3TfHru6LtBtXCKoO/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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