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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f36d154fb02064220ed336d801a9930ae812b24a1efd2d6d8ef8efcda2c251d' 
  AND token = 'rO4G9QcTnsHtYNxN+ib4VB3kKNfygwx0lk38aoKdFbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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