Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadd8ac840d2a13c6a9879ccdef3607835ec4d876931e92d8b21fed8a58d6856' 
  AND token = '+C+tUN2RcO/c8ZGWSZBEEGLtExBcKrNuTUIy1Q/e1uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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