Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bb5cb64b23b7a1114f5a0e5b456ed0645f05d92f432997fd6af471c24e18c4' 
  AND token = '998P2tdaomu7N7vRO297uCw4ZGnM3OUAj7pQA9gk4lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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