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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a866dd23961da93a50edf2627bf7184add9dce956122d4fbbbe9c44a26645693' 
  AND token = 'HPhQkN57clb93b1YArrY4MG65SZwxgyes19OCa5dmd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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