Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93257d8831b94461aae59fe859d60fea4cec633260da14883bdb19b866df897' 
  AND token = '5jn17owGNJk7X6E2xAHVtShxPcDxetwabaa6QBYPqPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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