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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a97adbf471b138b066f073c149e520ece72ca3e6de495037436a126cd1b3f0c5' 
  AND token = 'nyMgh9j4vSGpvC04SQHzkf06kWuYrLOqY0blnx1XVXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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