SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '079c41a44b16d177bd660ff0c67ba5637256ec2fff58deffca1b38940cc1feb4' 
  AND token = 'HYm81hOrfG2FyD7YOkJ/HjD+s9ZA9yZFPpLtuwLh43k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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