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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '775d246e136364842f31ab9b83625cbe2de4b11b368d7c634cee5d6eb176920f' 
  AND token = '6oKDnCNAv/3kVIMOCFZ4iOXOnXUNPN60XdMI/fsI+SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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