Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e3fc605ba4cac7c86cb0a1626f0f07696f655d11b17fd87ff5dba430c6a959' 
  AND token = '3ZG5FobJ4KvJM/NFOdTmGgoj357IIAc5P0TySGYL/Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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