SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '433eb3eb978937a02c3f19f30d3175810aed733114a863985019bf210bfaece4' 
  AND token = 'wNUmuGihIu9EnhnfZDT//yPzB7codwGpPENMGjOWx+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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