Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a226cf19386953851c94cab341de421281d970e7bb82fdd880b5ecaf56e6f8bc' 
  AND token = 'FtOFXZc8YNIJ2vhNxf6E/5VnkRENTgmuCSNtfQuztHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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