Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b828cda37781edb776080ae7ba5a893d1d7221767e800fbcc7fdb8ad935b6618' 
  AND token = 'bR0cNMbPzYUhWSCC5JtjWgIKGBqIjVYDgcjvkszNN3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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