Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c834306438db3cc491f050cd51c85cc43c3d03c9d11432c97fd27e8d01bf06ab' 
  AND token = 'xx7yJUuvU5Dtg4ZMz5MA/+peb1c9zvox1Y5PByeQHMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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