Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69e92ad8bb9716093041d8525342f8d29fb05cd2cfa27811ae2d3218efb31d3' 
  AND token = 'ng0WgqYRcRymz3mluWTcwphlA/DKFxwqEtn3BRkDpZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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