Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ab455f9070b4d196f9cdcd97a8095fc70e9124daffe26c338ff7066d4750a7' 
  AND token = '8C4/CNIDW0a/ZAPaXQBUdqzg3QzplBP2naFQ8U+kDvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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