SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '624814900abab24615fe3676564dce70935d358591bb2ba66409b979171f9476' 
  AND token = 'HBZ8Qnp3es+5m9j/vGrj6Jgs50XdU6KIc7ca+n6XluI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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