Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c6bebb4fb670a9f7e3ac9aa812a49347ee12432dcfdbc33de2a36b55a7d2ae' 
  AND token = 'sf+hQzz8WMSUkUSQjimxfNuDodnRWJNFrFHNF/JHcxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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