Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf6f8e8ac2e8267cf4b0fcbafcc5e0e0391d107e1f27a9bdfe84bf84f4d86b13' 
  AND token = '3NI8RfB0PhZbYzU7pFvAdoZNEEqOnaU73PvoUl00gF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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