Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5355d02b897c5be6648ac20948102aaec540e0e56eeebdc528c8efa26673bd42' 
  AND token = 'DW38ljEM3kn3Yjc8TJr7vqfKPYglfOrsirDGaqRVzHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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