Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd17e3a91cc7d94eebae91938a87ad38fd017d348dbab79b80219eb47f2dfac24' 
  AND token = 't4rnTwTZIAIyGiTplQnrJDKXpwzzOsUjFnMXR83/qyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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