Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfee69fab71805882651782d3741ceece1d78cbbcf4b7c9c659124bec987f574' 
  AND token = '4ZMlkOpKokiOxGxRSlWxmHsxSYdR/ZrcZOJaIR6UCWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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