Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115fb12f10bd383f9f3cae193345044173f0df19a5fdf7ed49340458e3ebb7ef' 
  AND token = '819Q8/b4iVeKHqaLqvob3wl6XmAStbOSypcVI+DfAig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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