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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c5bd5b269fb9112d99d4c75522a8692e493d6269de0a733ed23f43679ed9b7e' 
  AND token = 'jIZd8FZ3H1n7OXiEFRXyX62R9vkJXdyAHTnsckDCDJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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