Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20e939eb2ad4a733ca99e382dfad0080a00e4314afa9a2d2977dab5a9a536b7' 
  AND token = 'JXSpB00vv8S4nZ2kZ/QEzUMvaLc8GFUOraJF8Co96nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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