SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5e2f02d43e9bfa536675b86a274c5538a0e88fed31442d0613d3d9cbf21f517e' 
  AND token = '5lq6txgzyWhQKBlQjhzfBZOqNzh+c80fsEveTHIeIbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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