Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ab66dd9021885154a727613ce335e3bbe8e261e890b06e4aecd06d76eaa8bb' 
  AND token = '9QEBNdxFE9uZVjibxDo5OfDTripEWVlUcIpehbm1OeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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