Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba73ef08a869a2f1c19d6f74575c215d4c7d8ec900b704e6cfaf0ed35048eebf' 
  AND token = 'c+SMKH6FcaQgSonBeUyEBmcprrOtu4kBv/Q+1GfI9Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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