Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3733dceca379f807ed1bcdc354b599c0abe6ca541a186f545063af3e7b0ea96b' 
  AND token = 'b4rLC0Py4YUUYhvTBGMh5n1Mf4Y6+MuU4NLdFqKLQu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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