Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93ff3c6d4d1cdbf40a2caa63ddd6c8f3b581a72c32df7f3290bd725517df9763' 
  AND token = 'a3BTO5c5epHtw4PTHpiWjwlG6fJb7CmsuKzYenZqXPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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