Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb3b8807e0f0593365837488ecf6936b9238505269fa60f340e0b458d37413f' 
  AND token = 'fzyHnyhSXT/ixrzlwGVOTDAEz2EAp7EkiMsfvMyohHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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