SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '02fc9898b182812f6dd6bca29b4be6189f9d196344605dd0a00f3f5086a595f4' 
  AND token = 'c0+VQuBbwBLZGKY/UBxboTj5xHtAJhMeqdl/WDrWmB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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