SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4cfaa4ab94c8e77bab67769d44c313779a902dad555a038d7953d5b457a1fe09' 
  AND token = 'LLMlivBHYNDjj9ieu5U/b/1ShEqgJUwg/miZX9ry46Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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