Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a8f95ff82c8febd9d4bce852cb2d0764469589ee64dcb6fbcfb1303c1674bf' 
  AND token = 'pDbEDmVMclsko7fJT6+mnlFEbgeE0idzRpyxETgZ8qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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