Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577bb994ab173c8037cb1992d68712789da5dac4e2acc4c187f0f56967a904f2' 
  AND token = 'pk6QiuRH/6+E3IRMv07kKnMN0jON+u7BJO7ATLsekfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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