SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0af1bb7608844f978bb3cc7226eaf3bce8d671fa7504323da69f17759dbfcd2b' 
  AND token = '/bW+moQlLziCKF2SfBSVq8MJW6fYiWdIhSbL+dbjfE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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