SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd093ab934f9edc98ca3108d7f687bae714b3e33a307a187adffd4435fb60cc29' 
  AND token = 'uGIZuYaPmzpFC+dFQ5WDo7xXTqongWzfSACOM2mPk2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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