Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e722ba6edb7a86d7b24569b2220f297bcf59e712d97bb5d2cee7707d534a7f8' 
  AND token = 'JNQHd1/FxznMiDqpSzwHBuC6jV967v8uoDvYA4Wzjvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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