Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fced22694d323a33df570dc00fa794ea5037bdfa14ec3627cb6479bda39b22f6' 
  AND token = 'lxQ7W0TqPPbUAnyFyqVFTTVK7KzgnppnMIUEg5DzSv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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