Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503645e6ebee1e28c680047ecc3572c778f4fdc97f8f4a2ef7137bf79697e2b4' 
  AND token = 'M2KzJTPFaS/SPDVt5PaEbhcJ/CcR+Ii4+O1bYfNJ6kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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