Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbc130d5d0e88e5ec200e584945d74237e8e72968e3cbc51ad483289892b8b9' 
  AND token = 'DnJ4qpQ0CoMfKeTOKbGFUjtdD6fALoZJ4qAjwojaIzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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