Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a430812a8037507aa0a398235a3bc248372715e67e78f3e87a072e18233328e' 
  AND token = '9wLaK6jXCIXw7B1AUj8MdsxlVzMKmRL+o7nSiI92cfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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