Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761c56d12a2f6fcd5eb822778e71e1a51eb05f1d54ec145baaefd746ba1ce659' 
  AND token = 'fYjlWxpkaBlhRvwuYjqwoCjnp0EQZauHRQoTTr0HcnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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