Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23feef1f0c3f4c5db156dd8f4eb75cb016e72c9eece265e4f6adcaba016c2194' 
  AND token = 'qPtfS3fD01r09SnXyGz3UCj7tA/KttDTCptqQY0Nd5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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