Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caf1be936eeda4452bbbfc5678d38efc1ff674e3ad2ae9c7ec7aa42a8eec2ac' 
  AND token = 'wgp8GSMrCPiYa4RiMtnT/kLEypERM1OqKg7/p7zG/94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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