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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66139ec794852adb89795fb8c624e2eade20e99c242051aaba71ab0f4ab0777e' 
  AND token = 'jx6QXqvoh2gubuX88CWN7qYHc5Jk2AlwVHtNRMzXMls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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