Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e427b1798cabb4b77d4fd92e754b397b5e1a4df9c97efe7ffb442553b8b054' 
  AND token = 'z1fLzwOQNIoucLtTxr2+3WX5Xn9UBKTb6jfE6pfJPUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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