Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4ca2e75b0c32bd10feb91a6c0819443a7dcaa7a0532f4a24a4ae07c2e6e512' 
  AND token = 'N72RTzP3P+Jf2/TJz3PqemZB0KDcaU0sXRttD1xQrsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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