SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '297f5c18014699ee9c41573695b365dc01191f1b75c02d434304a4f85344c2dc' 
  AND token = 'zIzKjurZ20XvtR19LVQoc/al3ODEKjgO6QG3rZrdW2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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