SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8f242f91373aed4a857a6743e6b168b07117b20725bcc678116801c95be9a9c4' 
  AND token = 'bg7osii6F34nIZ8Md+vD0ZV+0vKGxp3ZBEV+T+x5quM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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