Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2489a17f13035f56e7fdf7a29544e5f5c1f8c9fcc9c67aa2ad82184fe6e4412f' 
  AND token = 'b7kYz/BScUpNDGpgPH0KvWEeUPFmEtY5w81YPxL9Pps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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