Sandbox

SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7ff21da6d448fc2f438d85b86cc23879e1ee2c2f9cd2cd05d540160de5bb9c51' 
  AND token = 'OLxF44MgineL4k8AptqPe2m0/AoxbpKnaGonL+o2Few=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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