Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c27eac88481f2942915df01bbeff37602c9cef6536bc367ba7cf3e58929bd69' 
  AND token = 'pR9vRvIHNZ4oNqxXAWmOmxsEgafVDcdnRvAkMqfs+fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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