Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b8ef2fb877cacee09a90498f1a3760f31bd1a5484fba4e7b33ca096ce22879' 
  AND token = '9CYYK8nQ3KVxDG6J8i5DARfvaO7eEKPQYA1pGXA7rLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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