SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '11f4fae09467dae71660d4145fa0e71574fddce631a55c7e8b659eb239277d82' 
  AND token = 'j3xlgQaaB0TRbL8lUPwfcypMtzZJCHahOvy1Kr+61ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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