Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1761e77f8d0eb55b3b5f2a9e1c98995b61c52fa9b5082cdc655f7455f77d1b' 
  AND token = '4aXUBMjeuBQp00IVrRRNb8I1+oBfRuI6uv4KprKRALA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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