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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8504ce7b7bb9777af7e170e0485ebc13ce365b5016308da3ea7720ace869c9d5' 
  AND token = 'jJ2pFZnves703hdjHXhx5/t3/+mUNV/yE1GlJ6FyKRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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