SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a2725e898187b22377e105a4292828a3e76c2c008755a9d170544192834cd485' 
  AND token = 'oEgww/+ivoG/F87l/Glf2BcsU/3/lkBnnK7zqdgzjX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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