Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5e454b1b029853d142c53d4503fe3d6a8b66550715a2066d86b3f29563e491' 
  AND token = 'U6tit2ypxyP+ehU59MFVIpKZmyBlHSs+iLlnDvO38sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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