Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828c8f1b0752c1c5bc31e1b65f9fb9fb47f84f9a9448e3bb2950d6f1208eb7e8' 
  AND token = '5pvUE2T7WiWdVlxh+dNsfaESRq8waVKYlYltmPp45hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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