Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bde7b7e97d2c5f50dd1ea2092916fe6cb2f8b7386a91100f50e9e4fdeeb78c' 
  AND token = 'MAZmCHzM1OtxdesqU2/je6EBDS1eb6thnV2DCVk0ygc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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