Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ddb5799c9e8539af60b0e0fbe0f9d08dc0752d456cbe2c21644e2f08860404d1' 
  AND token = 'BB86qqNZlnAj2CHuWlUZl5MPuCfm/5HVb1/CD4kDV0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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