Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd9c0b008a1018f46f2a46822a638101f41cdd68be9f7dcb74c78693a3d5b18' 
  AND token = 'hkvwXFuCXzEJlVZ8MIiAZmf1n/OscaqpYdkGcIydm10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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