Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a855d16658f3ebdc9303a8de5de52c89d98af5790fee259260c075f81c9238' 
  AND token = '4xdSa9fj/MIJuJQAvKupt0mvJ3in3/aA2kH5FOJGEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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