Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9404e192ecd339fa429959c1c35e5879c1084e3a58a1333a89d03ad769183c4' 
  AND token = 'qLUFRl0c+6+sRZRv3dnsrAl15a/FdmjVGD5Xl3xHEJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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