Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88abd7ccb1ff7ed4bff559e04091ac338f11872a6af8ab130fd6ade2bfab915' 
  AND token = 'CMS36DwC6H28coFYVvcaa0iGSJLkS8y0ZQZRgECJPpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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