Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8399b667f0801ae22114b0b66ccc86481dfcbf226e4ba9ed6d6eead1a0dac88f' 
  AND token = '+TiEJEF4dzF3WGniBt4VvJ9JV5GBEh6XjoZM43g4oxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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