Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d0d53024a1fe4f43f9b0f2a9936f7507124ef56c1e9188c7b5d4e67cf88ca5' 
  AND token = 'D1utvO15qoAQnwBfLrnBCAz7X2lwvZDngmkVfT7WvZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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