Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd7842a7c631a8121e022a0f521e09d410537fc8e8fa8c3f63a791ed0547554' 
  AND token = '+Is4+btm5MqD0YMyYIFe10xNQ/6UHRTql7JtlpdZwK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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