Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a0d6c5b997d6f216220bde587513829474daa7095e63355884d419e09023e5' 
  AND token = '1FLmAGTLntwsZ9WtphB9ByHmz5DrPWbswb7YOHCXLMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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