Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677caccd2885770ee742fa751fcf13e648c33873f67dd0ae483e1356e1ef0ff5' 
  AND token = '9bM0w7RNztbErcDGnUqM/olZRYp0khpcLFY9DEivrUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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