Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d37496a9d47d09b3b2d5a58b92bcd3ee597ebb1952f72c9e5852c2261fe30e' 
  AND token = 'Zr1Wm0e/g2Wjqxuqwai61KyOqpOaCa53lzy0UiK7ahw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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