Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5e780e219eb6cde7fc571a75a8588c1dcf02bcdbad146bc10df6edc137a8cf54' 
  AND token = 'lCMu0eDy0XaHGRJTpYD0iS3OTY/nCCTdrGkmuJqwwm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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