SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '957529def1f553aaab30fa59e46d61cfe218a2e0405084e58df1a276cdb494ef' 
  AND token = 'HfuuQJ2U3RhzV/7UT3AjYkpB+mBA5MDLpmz2t9SfPJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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