Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f3130c3fbc767828af472ab8c4814082ed4f736d436a39ed8bbb4fc85f24df93' 
  AND token = '+7Ny8iEeHCuc2RG7Lk+oWwbbEggFhOBLjpV7GmNrvlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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