Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f14ec58d6071f8452735013a4280f4122f40615ad0fc7137424e6b90406196' 
  AND token = 'S5lIJCgNkd2ZrRLB0I5MlHjWqttowccbD/EO6YSDNws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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