Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9bb66df37c932f849af8e9c3c81e30156a5db5327a0f8fb026b028307905dc' 
  AND token = 'tKCYIvBuC+1QP2kQ+66LlsAP3bwOu0Uorj636q6qrRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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