Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67449df1d668dc65aa663c7ac21cde5d19e4db8fe5eceb97165f8bb9257b02fc' 
  AND token = '2f8F5v3rQnu49XK6od1q5QNIHj686DZvgYzmjGFobxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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