Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525f0fe7b3c7be43e03977e2d9cd948b0e689bb107a85e3be2b1b33fb3ad1453' 
  AND token = 'yGR8ZbCapHe7hASw24hxBlh8YWsDSKvbn4YxzNKu3FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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