Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4479e840f0245ae8d6e8b5db12e6eb6c14bf02aecf9a69523aa797cf3a76cc2' 
  AND token = 'E7J21ZQsSJLEjXuhfN7HkjGyYJMebeyZUThsBpDX80Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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