Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82ec6266aac2dd71ab21abab7d7b6a7e66382536f5c8088a8cd24ee81c6d3a5' 
  AND token = 'LVVaerUbTpikRxVoOoijKIuJQPD1PhQutj5gWMdLobc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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