Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15dc43646332fa284f3ddc513e88ef7cab148b4352bb986c4ee1d2d9da683769' 
  AND token = 'J6yeaZjHQ3akcpH6PfEA/+B0PWcFSMrTK/PhR9AhBbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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