Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '453ddb5c34601eb1f64eeabf4a1e0042cb50d3376ebe3b2a69891e0fb208e7d8' 
  AND token = 'FafHHhKsNPs7xEMRVOwqmEsdh89RT5QUT3R/8g07Ir0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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