Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02de5cb2dbdc7b7cb87d7ad65b8f84396b12fbab70fa479ec9cb5d92cc01af5' 
  AND token = '76OSyLXkYZ9GkOiAsBzz+Q4f+i+bBPiEE8VgJBgIrYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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