Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb53e53ac807854712a61a89d07e0d8a4fe7dbdd6effb0c79eece5bc0259bdb5' 
  AND token = 'nCEN11nnSIAI6TfnYdqCc3+D/pudjz1sEAYf6J+gZNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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