Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3781428593dcac6cca6464273f680016f79620313bb5647be23cc9a9846fd38' 
  AND token = 'rXoy6yRRBbmoIPK420MTX6FpZUlZMnL3DVrpzph3jsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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